php实现大文件断点续传下载实例代码

php实现大文件断点续传下载实例，看完你就知道超过100M以上的大文件如何断点传输了，这个功能还是比较经典实用的，毕竟大文件上传功能经常用得到。

require_once(\'download.class.php\'); 
date_default_timezone_set(\'Asia/Shanghai\'); 
error_reporting(E_STRICT); 
function errorHandler($errno, $errstr, $errfile, $errline) { 
 echo \'<p>error:\', $errstr, \'</p>\'; 
 exit(); 
} 
set_error_handler(\'errorHandler\'); 
define(\'IS_DEBUG\', true); 
$filePath = \'test.zip\'; 
$mimeType = \'audio/x-matroska\'; 
$range = isset($_SERVER[\'HTTP_RANGE\']) ? $_SERVER[\'HTTP_RANGE\'] : null; 
if (IS_DEBUG) { 
// $range = \"bytes=1000-1999\\n2000\"; 
// $range = \"bytes=1000-1999,2000\"; 
// $range = \"bytes=1000-1999,-2000\"; 
// $range = \"bytes=1000-1999,2000-2999\"; 
} 
set_time_limit(0); 
$transfer = new Transfer($filePath, $mimeType, $range); 
if (IS_DEBUG) { 
 $transfer->setIsLog(true); 
} 
$transfer->send();

download.class.php

/** 
 * 文件传输，支持断点续传。 
 * 2g以上超大文件也有效 
 * @author MoXie 
 */ 
class Transfer { 
 /** 
  * 缓冲单元 
  */ 
 const BUFF_SIZE = 5120; // 1024 * 5 
 /** 
  * 文件地址 
  * @var <String> 
  */ 
 private $filePath; 
 /** 
  * 文件大小 
  * @var <String> Php超大数字 字符串形式描述 
  */ 
 private $fileSize; 
 /** 
  * 文件类型 
  * @var <String> 
  */ 
 private $mimeType; 
 /** 
  * 请求区域（范围） 
  * @var <String> 
  */ 
 private $range; 
 /** 
  * 是否写入日志 
  * @var <Boolean> 
  */ 
 private $isLog = false; 
 /** 
  * 
  * @param <String> $filePath 文件路径 
  * @param <String> $mimeType 文件类型 
  * @param <String> $range 请求区域（范围） 
  */ 
 function __construct($filePath, $mimeType = null, $range = null) { 
  $this->filePath = $filePath; 
  $this->fileSize = sprintf(\'%u\', filesize($filePath)); 
  $this->mimeType = ($mimeType != null) ? $mimeType : \"application/octet-stream\"; // bin 
  $this->range = trim($range); 
 } 
 /** 
  * 获取文件区域 
  * @return <Map> {\'start\':long,\'end\':long} or null 
  */ 
 private function getRange() { 
  /** 
   * Range: bytes=-128 
   * Range: bytes=-128 
   * Range: bytes=28-175,382-399,510-541,644-744,977-980 
   * Range: bytes=28-175\\n380 
   * type 1 
   * RANGE: bytes=1000-9999 
   * RANGE: bytes=2000-9999 
   * type 2 
   * RANGE: bytes=1000-1999 
   * RANGE: bytes=2000-2999 
   * RANGE: bytes=3000-3999 
   */ 
  if (!empty($this->range)) { 
   $range = preg_replace(\'/[\\s|,].*/\', \'\', $this->range); 
   $range = explode(\'-\', substr($range, 6)); 
   if (count($range) < 2) { 
    $range[1] = $this->fileSize; // Range: bytes=-100 
   } 
   $range = array_combine(array(\'start\', \'end\'), $range); 
   if (empty($range[\'start\'])) { 
    $range[\'start\'] = 0; 
   } 
   if (!isset($range[\'end\']) || empty($range[\'end\'])) { 
    $range[\'end\'] = $this->fileSize; 
   } 
   return $range; 
  } 
  return null; 
 } 
 /** 
  * 向客户端发送文件 
  */ 
 public function send() { 
  $fileHande = fopen($this->filePath, \'rb\'); 
  if ($fileHande) { 
   // setting 
   ob_end_clean(); // clean cache 
   ob_start(); 
   ini_set(\'output_buffering\', \'Off\'); 
   ini_set(\'zlib.output_compression\', \'Off\'); 
   $magicQuotes = get_magic_quotes_gpc(); 
//   set_magic_quotes_runtime(0); 
   // init 
   $lastModified = gmdate(\'D, d M Y H:i:s\', filemtime($this->filePath)) . \' GMT\'; 
   $etag = sprintf(\'w/\"%s:%s\"\', md5($lastModified), $this->fileSize); 
   $ranges = $this->getRange(); 
   // headers 
   header(sprintf(\'Last-Modified: %s\', $lastModified)); 
   header(sprintf(\'ETag: %s\', $etag)); 
   header(sprintf(\'Content-Type: %s\', $this->mimeType)); 
   $disposition = \'attachment\'; 
   if (strpos($this->mimeType, \'image/\') !== FALSE) { 
    $disposition = \'inline\'; 
   } 
   header(sprintf(\'Content-Disposition: %s; filename=\"%s\"\', $disposition, basename($this->filePath))); 
   if ($ranges != null) { 
    if ($this->isLog) { 
     $this->log(json_encode($ranges) . \' \' . $_SERVER[\'HTTP_RANGE\']); 
    } 
    header(\'HTTP/1.1 206 Partial Content\'); 
    header(\'Accept-Ranges: bytes\'); 
    header(sprintf(\'Content-Length: %u\', $ranges[\'end\'] - $ranges[\'start\'])); 
    header(sprintf(\'Content-Range: bytes %s-%s/%s\', $ranges[\'start\'], $ranges[\'end\'], $this->fileSize)); 
    // 
    fseek($fileHande, sprintf(\'%u\', $ranges[\'start\'])); 
   } else { 
    header(\"HTTP/1.1 200 OK\"); 
    header(sprintf(\'Content-Length: %s\', $this->fileSize)); 
   } 
   // read file 
   $lastSize = 0; 
   while (!feof($fileHande) && !connection_aborted()) { 
    $lastSize = sprintf(\"%u\", bcsub($this->fileSize, sprintf(\"%u\", ftell($fileHande)))); 
    if (bccomp($lastSize, self::BUFF_SIZE) > 0) { 
     $lastSize = self::BUFF_SIZE; 
    } 
    echo fread($fileHande, $lastSize); 
    ob_flush(); 
    flush(); 
   } 
   set_magic_quotes_runtime($magicQuotes); 
   ob_end_flush(); 
  } 
  if ($fileHande != null) { 
   fclose($fileHande); 
  } 
 } 
 /** 
  * 设置记录 
  * @param <Boolean> $isLog 是否记录 
  */ 
 public function setIsLog($isLog = true) { 
  $this->isLog = $isLog; 
 } 
 /** 
  * 记录 
  * @param <String> $msg 记录信息 
  */ 
 private function log($msg) { 
  try { 
   $handle = fopen(\'transfer_log.txt\', \'a\'); 
   fwrite($handle, sprintf(\'%s : %s\' . PHP_EOL, date(\'Y-m-d H:i:s\'), $msg)); 
   fclose($handle); 
  } catch (Exception $e) { 
   // null; 
  } 
 } 
}

总结

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